Apparatus for removing deleterious material from pulp stock



Apri 1, 1967 H. A. DELCELLIER APPARATUS FOR REMOVING DELETER 3,313,413 IOUS v MATERIAL FROM PULP STOCK 4 Sheets-Sheet 1 Filed Aug. 31, 1964 INVENTOR. HENRI A. DELCELL/ER April 11, 1967 H. A. DELCELLIER 3,

APPARATUS FOR REMQVING DELETERIOUS MATERIAL FROM PULP STOCK Filed Aug. 31, 1964 4 Sheets-Sheet 2 INVENTOR. HENRI A. DELCELL/ER ATTORNEY April 11, 1967 H. A. DELCELLIE 3,313,413

APPARATUS FOR REMOVING DEL ERIOUS MATERIAL FROM PULP STOCK Filed Aug. 31, 1964 4 Sheets-Sheet 3 INVENTOR. HENRI A. DELCE'LL/Ef? ATTORNEY April 11, 1967 H. A. DELCELLIER 3,313,413

APPARATUS FOR REMOVING DELETERIOUS MATERIAL FROM PULP STOCK Filed Aug. 31. 1964 4 Sheets-Sheet 4 I f 42 x 4 4 4A E 14' 4.4 l H n 48 540 1 3 5 48 igfifi" i 54c 56D 1 ig 54 56C 4 4 4e -3ec 5 o- INVENTOR.

HENRI A. DELCELL/ER BY I I ATTORNEY United States Patent APPARATUS FOR REMGVING DELETERIOUS MATERIAL FROM PULP STOCK Henri A. Delcellier, Beaurepaire, Quebec, Canada, as-

signor to Canadian Ingersoll-Rand Co., Ltd., Montreal, Quebec, Canada, a corporation of Canada Filed Aug. 31, 1964, Ser. No. 393,266

Claims. (Cl. 209211) The present invention relates to pulp stock cleaning apparatus and more particularly to an improved separating device for such apparatus.

Heretofore, conventional pulp stock cleaning apparatus utilized a fiuid vortex to centrifugally move deleterious materials, such as dirt and the like, in the pulp stock against the walls of the pulp stock cleaning apparatus with certain undesirable results, namely:

(1) The loss of some good pulp fiber in the rejects or discharge outlet through which the deleterious materials are ejected;

(2) The introduction by the fluid vortex of ambient air into the separated pulp stock, which ambient air is deleterious to the further processing of the pulp stock; and

(3) The lack of controlled dilution of elutriation during the separating operation.

Some conventional pulp stock cleaning devices of the type shown in U.S. Patent 2,849,930, issued September 2, 1958, to H. Freeman, et al., employ a vacuum means for evacuating the undesirable central fiuid core of ambient air from the separated pulp stock.

It is the general object of the present invention to avoid and overcome the foregoing and other difficulties of and objections to prior art practices by the provision of an improved separating device for pulp stock cleaning apparatus which improved separating device:

(1) Prevents substantially the loss of good fiber in the separated pulp stock through the rejects outlet;

(2) Eliminates substantially the introduction of ambient air into the separated pulp stock; and

(3) Provides controlled elutriation of the pulp stock during the separating operation.

The aforesaid objects of the present invention, and other objects which will become apparent as the description proceeds, are achieved by providing a separating device for a pulp stock cleaner for separating deleterious material from pulp fiber and having a body provided with a pulp stock inlet means and a deleterious material discharge means. This separating device has a plurality of baifie means carried by the body disposed between the pulp stock inlet means and the deleterious material discharge means. The bafiie means defines chamber means therebetween. The bafile means are provided with pulp stock aperture means for permitting the introduction of the pulp stock into the bafiie means and the discharge of the deleterious material from the bafile means to the deleterious material discharge means. The baflle means are also provided with fiber discharge means for providing a labyrinth path away from the deleterious material discharge for the discharge of pulp fiber from the baffie means.

For a better understanding of the present invention, reference should be had to the accompanying drawings, wherein like numerals of reference indicate similar parts throughout the several views and wherein:

FIG. 1 is a side elevational view partially in vertical section of a free vortex type centrifugal cleaner incorporating the separating device of the present invention;

FIG. 2 is an enlarged fragmentary vertical sectional view of the separating device with the tabs on the bafile means on the body extension eliminated for clarity;

FIGS. 3A-3D are plan views of the individual baffle means;

FIG. 3E is a horizontal plan view of the top baifie of the separating device taken along the line 3E-3E of FIG. 2 in the direction of the arrows;

FIG. 4 is a view similar to FIG. 2 of an alternative embodiment utilizing tubes with bolts removed for clarity; and

FIG. 4A is a horizontal sectional view along the line 4A4A of FIG. 4 in the direction of the arrows.

Although the principles of the present invention are broadly applicable to pulp and paper stock cleaning apparatus, the present invention is particularly adapted for use in conjunction with free vortex type centrifugal cleaners and hence it has been so illustrated and will be so described.

With specific reference to the form of the present in vention illustrated in the drawings, and referring particularly to FIG. 1, a free vortex type centrifugal cleaner is indicated generally by the reference numeral 10.

Pulp stock enters tangential inlet 12 (FIG. 1) of the centrifugal cleaner 1( under pressure and is directed against the wall 14 of the body or tubular member 16 of the centrifugal cleaner 10 by an inlet orifice 18, so that the flow progresses spirally downwardly in the direction of the outer helical arrows as viewed in FIG. 1. Fine grit, dirt and the like 20, which are heavier than acceptable stock containing fibers 22, are thrown spirally in the direction of the outer arrows FIG. 1 by centrifugal force against the wall 14 of the body 16 and move downwardly as viewed in FIG. 1, toward bleed tip or outlet for deleterious material 24, in deleterious material zone 26 (FIG. 2). The cleaned or acceptable stock tends to remain in the clean stock ZOne 28 and is drawn up spirally in the direction of the inner arrows FIG. 1 through the clean stock discharge 30 by the pressure differential between the inlet 12 and the clean stock discharge 30 which on all sides is in the order of 50 p.s.i.g. In the center of the body 16 there is an air bubble zone 32.

As the deleterious material 20, containing good fibers 22 nears the bottom of the body 16 as viewed in FIGS. 1 and 2, it enters the separating device 34 of the present invention.

Separating device The improved separating device 34 comprises a plurality of baffle means 36A, 36B, 36C, 36D, 36E (FIG. 2) secured (by overlapping tabs 38, FIG. 3E, on the bafile means 36A, etc.,) to tabs 40 on body extension 42 by bolts 44 for example, or by welding the tabs 38 to the body. The baffle means 36A, etc., define chamber means 46A, 46B, 46C, 46D, therebetween.

The bafile means 36A, etc., are each provided with pulp stock aperture means 48 (FIG. 2) for the passage or introduction of the deleterious material stock into the baffle means 36A, etc., and for the discharge of the deleterious material 20 in the direction of the arrows FIG. 2 from the bafiie means 36A, etc., to the deleterious material discharge means (i.e., the bleed tip 24).

Each of the bafile means 36A, etc., is provided with randomly disposed fiber discharge means or holes 50 providing a labyrinth path (as indicated by the arrows in FIG. 2) away from the deleterious material zone 26 for the discharge of good fibers 22 from the baffle means 36A, etc., spirally upwardly through the clean stock zone 28.

Alternative embodiments In FIGS. 4, 4A, tubes 52 randomly disposed between the baflie means 36A etc., are used to integrate the baffle means 36A, etc., and to provide a directed path for the reclaimed fibers 22. Bolts 53 FIGS. 4, 4A, secure the bafiles 36A*, 36B, 36C*, 36D and 36E in the body extension 42 Nozzle means, such as the nozzles 54A, 54B, etc., are disposed tangentially, FIG. 4A, in the chamber means 46A, etc., respectively, for enhancing the vortexing, the deleterious material 20 toward the bleed tip 24 (not shown in FIGS. 4, 4A) and the good fibers 22 toward the clean stock discharge 30 (not shown in FIGS. 4, 4A) and for introducing elutriation fiuid, such as water, therein to dilute the thickened pulp stock, separating the good fibers 22 from the dirt, etc., 20 and carrying the good fibers 22 upwardly (FIG. 4) toward the clean stock discharge 30 (not shown in FIGS. 4, 4A). The elutriation fluid introduced through nozzles 54A-D will cause the good fibers to whirl in a direction opposite to that of the pulp stock at the inlet 12. This aids in carrying the good stock towards the discharge 30 and the deleterious material towards the discharge 24.

Control means, such as valves 56A, etc., are provided in the nozzles 56A, etc., respectively, for selectively controlling the elutriation and vortexing of the pulp stock undergoing separation.

It will be recognized by those skilled in the art that the objects of the present invention have been achieved by providing an improved separating device which:

(1) Prevents substantially the loss of good fiber in the separated pulp stock through the rejects outlet;

(2) Eliminates substantially the introduction of ambient air into the separated pulp stock; and

(3) Provides controlled elutriation of the pulp stock during the separating operation.

While in accordance with the patent statutes preferred and alternative embodiments of the present invention have been illustrated and described in detail, it is to be particularly understood that the invention is not limited thereto or thereby.

I claim:

1. A pulp stock cleaning device for separating deleterious material from pulp fiber comprising:

an elongated tubular member;

means at one end of said tubular member for introducing stock to be cleaned into said tubular member and creating a vortex flow of stock in said tubular member;

an outlet for pulp fiber at said one end of said tubular member;

an outlet for deleterious material at the other end of said tubular member;

a plurality of bafile plates mounted in said other end of said tubular member and spaced from each other to define chamber means;

said baffie plates being arranged to allow stock to be cleaned to pass into said chamber means and being spaced from the internal wall of said tubular member to define a continuous passage for said deleterious material between said plates and said internal wall to said outlet for deleterious material; and said bafiie plates being provided with a plurality of apertures randomly spaced to provide a labyrinth path for cleaned stock moving toward said pulp fiber outlet.

2. The cleaning device of claim 1 wherein said introducing means is a tangential inlet and the inside of said tubular member between said inlet and baffie plates is substantially unobstructed.

3. The cleaning device of claim 2 further including tubular means disposed between said baflie plates for directing the flow of clean pulp fibers.

4. The cleaning device of claim 3 further including nozzle means in said chamber for increasing the flow of deleterious material toward said deleterious material outlet and pulp fibers toward said pulp fiber outlet.

5. The cleaning device of claim 2 wherein said tubular member is conical from substantially the midpoint of its length to the deleterious material outlet.

References Cited by the Examiner UNITED STATES PATENTS 2,633,930 4/1953 Carter 209144 X 2,849,930 9/1958 Freeman 2092l1 X 3,039,608 6/1962 Wikdahl 2092l1 FRANK W. LUTTER, Primary Examiner, 

1. A PLUP STOCK CLEANING DEVICE FOR SEPARATING DELETERIOUS MATERIAL FROM PULP FIBER COMPRISING: AN ELONGATED TUBULAR MEMBER; MEANS AT ONE END OF SAID TUBULAR MEMBER FOR INTRODUCING STOCK TO BE CLEANED INTO SAID TUBULAR MEMBER AND CREATING A VORTEX FLOW OF STOCK IN SAID TUBULAR MEMBER; AN OUTLET FOR PULP FIBER AT SAID ONE END OF SAID TUBULAR MEMBER; AN OUTLET FOR DELETERIOUS MATERIAL AT THE OTHER END OF SAID TUBULAR MEMBER; A PLURALITY OF BAFFLE PLATES MOUNTED IN SAID OTHER END OF SAID TUBULAR MEMBER AND SPACED FROMEACH OTHER TO DEFINE CHAMBER MEANS; SAID BAFFLE PLATES BEING ARRANGED TO ALLOW STOCK TO BE CLEANED TO PASS INTO SAID CHAMBER MEANS AND BEING SPACED FROM THE INTERNAL WALL OF SAID TUBULAR MEMBER TO DEFINE A CONTINUOUS PASSAGE FRO SAID DELETERIOUS MATERIAL BETWEEN SAID PLATES AND SAID INTERNAL WALL TO SAID OUTLET FOR DELETERIOUS MATERIAL; AND SAID BAFFLE PLATES BEING PROVIDED WITH A PLURALITY OF APERTUES RANDOMLY SPACED TO PROVIDE A LABYRINTH PATH FOR CLEANED STOCK MOVING TOWARD SAID PULPFIBER OUTLET. 